Machine for drilling porcelain.



J. RIDDELL..

MACHINE PoR DRILLING PORCELAIN.

APPLICATION FILED AUG. S, 1908.

Patented Apr. 9, 1912.

3 SHEETS-SHEETl 1.

, MIM

INVENTCIR.

@W Q4. JUHN FUDDELLH. #uw Y wvl-m5555151 -ATTY.

J. RIDDELL.y MACHINE FOR DRILLING PORCELAIN.

. APPLICATION FILED AUG. 8, 1908. u v1,()228'7LL Patented Apr. 9, 1912.

3 SHEETS-SHEET 2.

4 Fl j.

INVENTEIR Jul-IN HIDDEN...

bY. ATTY.

Y J. RIDDBLL.

MACHINE FOR DRILLING PORCELAIN.

APPLIOATION PILBDAUG. s, 190s.

Jul-1N FMDDELI.

UNITED sTATEs PATENT oFFIoE JOHN RIDDELL, F SCHENECTAiDY, NEW YORK, ASSIGNOR TO GENERAIJ ELECTRIC COM- PANY, A CORPORATION Oli?v NEW YORK.

MACHINE FOR DRILLING PORCELAIN.

Specification of Letters Patent.

useful Improvements in Machines for Drill-v ing Porcelain.-

-This invention relates to thel art of mak- 4 ing porcelain ware, and 'especially the linsulators used to separate sections of trolley lines, or to support transmission lines carrying high potential. These link strain insulators consist of a solid disk vof porcelain having a rim provided with double flanges to aord a long tcreepagey surface between line portions of the circuit, and insuring the sheltering of some part of said surface from the rain. The center of the disk is thickened, forming a body to contain two interlinked U-shaped holes, one in each side of t-he disk, through which the cables or guy Wires are threaded. These 4holes must be drilled in the green porcelain, and the present invention is a mach-ine for doing this drilling. Inasmuch as.' the holes are U-shaped or, more properly, semicircular,

-themachine is designed to drill one half of a hole at each operation, the halves meeting 1n the body of the disk. The machine also cuts awayr the stock between the hole and the thinner portion of the disk, to facilitate the insertion of the wire or cable. vIt also rounds off the body between the ends of the hole. The insulator is mounted in a holder which is capable of rotary and rocking movements, while the drill is so mounted that -its angle of approach to thework can be altered. The drill is both rotatable and reciprocable in any angular position to which it can be adjusted. Y -j n In the accompanying drawings, Figure 1 1s a perspective view of a machine embodying my invention; Fig. 2 is a plan view of the same, with the drill and work-holder removed; Fig. .3 is a side elevation, part-ly in section, of the drill and its motor; Fig. 4 is a cross section on the line 4 4, Fig. 3; F ig. 5- is an elevation of the work-holder holding an insulator; Fig. 6 is a cross section of the completed insulator; and' Figs. 7, 8 and 9 are sectional plan views showing the operation of the machine.

On a' standard 1 is secured a bed-plate or table `2 containing Ways 3 concentric with a -pivot 4 on which is pivoted a carriage 5 engaging with the ways and capable of lateral angular movement over said table.- The carrlage can be locked in three positions of angularadjustme'nt, preferably by means of a spring catch 6 engaging with holes 7 inl the table. A drill 8 is mountedon the table, with means for rotating it, preferably an Velectric motor 9 which drives the drill through gearing 10, 11. lThe hub 12 of the gear 11 is rather long, and splined therein is` the drill holder 13. A sleeve 14, located between collars 15 on said holder, is provided with rack-teeth 16 which mesh with a gear wheel 17 journaled in lugs 18 on the frame 19 carrying the drill; saidoframe being conveniently mounted on the frame of thel motor. The gear-wheel 17 can be rotated by La crank 20 which has a spring latch 21 engaging notches in a quadrant 22 on the drill-fra1ne. The latch is preferably operated by a plunger 23 in the crank, having a thumb-piece 24 and a 'wedge.25 to lift v the latch. The cutting element of the drill is a small disk 26 of hardened steel rotatably journaled in an axialslot in the end of the drill-shank 27. The axis of the drill is in the vertical plane of the pivot 4, and the shank 27 extends beyond said pivot at all times.

`The work-holder consists of a circular i frame 28 having two sets of diametrically opposite trunnions 29 30 arranged at right angles. Midway between the 't-runnions ofthe two sets are laterally projecting arms 3l upon which are supported two sheet ymetal pans 32. Each ypan is conformed to one side of an insulator 33 and has a central opening 34 with oppositely arranged radial slots 35; the slots in -one pan being at` right angles to those in the other. One pan-is fastened to its arms 31 by strips 36. Similar/strips on the other pan are detachably secured to ,the arms 31 bycatches 37 The frame 28 is held in .a yoke 38, one pair of'trunnions being recelve'd innopen bearings 39in the upper ends of the arms of said yoke, while the lowermost trunnion of the othervpair enters a socket in the crotch of the yoke and thus holds the frame steady. The yoke extends up from a base 40 which is swiveled on ,a stud 41 rising from a. carrier'42 mounted on a support 43 rigidly secured to the table 2 adjacent to the. pivot 4.

The swivel joint can `be locked by a set screw 44. The carrier has'two downwardly y Patented Apr.y9, 1912. I Application Vfiled August 8, 1908. Serial No. 447,563. I

projecting pivot pins 45 45 inthe rear of the holder which engage in slots 46: 46 in the support 43, each slot being curved onv an arc struck from the other pivot pin. Locking devices, such as` the removable transverse bolts 47 47 keep the pivot pins normally at the inner ends of said slots.

The operationis as yfollows: The removable pan 32 is taken 0H and an insulator 33 is placed against the other pan and secured by replacing the removable pan. The frame 28 is insertedy in the yoke 38 in the position shown in Figs. 5 and 6. The drill carriage 5 is adjust-ed in its central position, with the shank 27 of the drill in line with the center of the insulator, and the rotating cutter 26 is moved up against the surface of thework. The yoke 38 is then turned by hand on its pivot stud 41, whose axis is in line with the center of the semi-circular hole 48 to be cut in the` insulator and at right angles to the axis of the drill shank. This operation (Fig. 7) cuts a semicircular groove 1n the face of the central body of thel insulator, concentric with the center of t-he hole to ,be cut. -The ends of this groove enter the body, leaving a thin wall 49, as shown at the right side of the insulator in Fig. 7. To remove this wall, the drill carriage is set over, say to the left, swinging the cutter to the right, as

shown in Fig. 8, so that its shank is tangent to the inner wall of the groove already cut. The bolt 47 holding the opposite side ofOt-he carrier is .pulled out, and the carrier is rocked back and forth on its rightv hand pivot pin 45', and 'the cutter is advanced until it reaches the position indicated in Fig. 8. This causes the cutter to form and smooth oli1 the curved surface 50. The car- ,hole thus formed meets the one previously drilled and completes the orifice. The frame I 28'is then lifted out of the yoke, faced about, and given a quarter revolution in its own plane `toubring' the trunnions 30 into positionl to enter the bearings 39. All the above-describedoperations are then repeated on that face of the insulator, resulting in the semicircular hole 51 interlinking with the hole 48.

7What 1I claim as new and desire to secure by Letters Patent of the United States, is:

1. A machine for drilling porcelain, comrising a rotary cutter, a plvoted vcarriage or said cutter, a work-holder, and means whereby saidholder may be rotated on any one of three parallel axes prependicular to the axis of the cutter-shank.

2. machine for drilling porcelain, comprising a rotary cutter, means for approaching' it to the work at diiferent anvles, a workA holder mounted on a swivelepart, and a carrier for said swiveled part capable of rocking laterally on either of two pivotal points.

3. A machine for drillingl a semicircular hole in porcelain insulators, comprising a rotary tool, a holder for the insulator, means for'pivotally supporting said holder whereby it can be rotated on the axis of the hole to be bored, and means for engaging said pivotal supporting means whereby said holder can-be rocked on an axis eccentric to said hole.

4. A machine for drilling a semicircular hole in porcelain insulators, comprising a table having Ways, a carriage pivoted on said table and ridin on said ways, a motor on said table, a dril mounted on the motor frame and geared to said motor, means for reciprocating said drill, and means for sup .porting the insulator comprising a work holder, a swiveled part on which said holder is mounted,said part being arranged with its l,axis perpendicular to the axis of said drill and capabley of rocking about either -of two other pivotal axes. f

5. A machine for drilling porcelain insulators, comprising a rotary cut-ter, a swiveled part, a work holder mounted on said part, a carrier on which said part is swiveled, a support for said carrier provided with slots,

and pivot pins on said carrier engaging said slots. A

In witness whereof,'I have hereunto set my hand this 7th day of August, 1908.

JOHN RIDDELL. Witnesses:

BENJAMIN B. HULL, HELEN ORFoRD. 

